you just need to wear the two clips on your wrist . It has printer inside ,

1 The machine has two different checking mode, First, you can test 25 modes at a time, Second, you can check item many times, means you get 25 times results one by one.2 Put into correct personal information before checking, including: Name /age /marriage /gender/body shape3 let the checked pepole have 5minutes rest to make sure the checked skin clear.4 Print the Report